Experimental Evaluations of Stabilization Methods for High Sulfate Soils in Iran Desert Roads

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ARAGHI MORTEZA; NOFERESTI HOSSAIN

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:3 Page(s): 141-151

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Title

Experimental Evaluations of Stabilization Methods for High Sulfate Soils in Iran Desert Roads

Author(s)

ARAGHI MORTEZA | NOFERESTI HOSSAIN | Issue Writer Certificate

Keywords

Soil stabilizationQ1

High sulfate saline soilsQ1

Khor-Arababad axisQ1

Abstract

Most of the current and under-construction road projects of Iran pass through vast deserts, which are often lacking suitable materials for use in road construction. On the other hand, due to transportation distance, carrying good soil to road construction sites is not often economical. This paper investigates the Soil stabilization method in the Khor-Arababad road construction project in South Khorasan Province. The choice of the stabilizing agent depends on the chemical and physical condition of the soil and factors such as atmospheric conditions, traffic volume, cost-effectiveness and the purpose of stabilization. Road construction engineers usually have good knowledge and experience in evaluating, understanding and managing the physical properties of soils, but they are seriously incapable in evaluating and managing the chemical properties of soil, which are even more important than the physical issues. In this paper, the importance and the vital status of soil chemistry studies in road construction have been emphasized. Initial chemical experiments showed that most of the samples were classified as saline soils. Seven sampling stations were selected to study the physical and mechanical properties of soil. The laboratory experiments performed included sieve analysis test, sand equivalent test, specific gravity, plastic and liquid limit, compaction, California bearing ratio (CBR) and swelling. Considering the financial factors, the first option of Soil stabilization was lime. Also, two types of iron slag namely ground granulated blast furnace slag (GGBFS) and foamed blast furnace slag(FBFS) were used. Moreover, due to the existence of a magnesium oxide factory and the Qalazari copper mine near the Khor-Arababad axis, magnesium oxide and copper tailing were also investigated as potential soil stabilizing agents in this study. Lime samples were prepared with 2, 5 and 10% lime to determine the optimum amount of lime. The optimal percentage of the other three stabilizing agents, according to previous studies, was 5%, and 2% of the lime was added to half of the samples as a catalyst. Three admixtures of 5% lime, 5% fine magnesite and 2% lime, and 5% copper tailing demonstrated the best performance regarding the increased CBR, uniformity of effect on all samples, and a slight swelling of 7-day cured samples. Another reason behind putting aside the iron slags was that the three additives while showing better or similar performance to the iron slags were also economically advantageous given the short distance of transportation. In the case of fine magnesite, there is also a concern that in the long run, the expansive magnesium sulfate (MgSO4) may form in the soil. Therefore, the use of 5% lime additive or 5% copper tailing is preferred. From an economic point of view, it should be noted that the lime should be purchased from the nearest lime production mine and transported to the road construction site. However, copper tailing is the waste of the processing plant of the Qalazari copper mine, which can be provided for free or at a very low price. Therefore, the use of copper tailing is much more cost-effective and 5% copper tailing was proposed as the final option of Soil stabilization in the Khor-Arababad road construction project.

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APA: Copy

ARAGHI, MORTEZA, & NOFERESTI, HOSSAIN. (2018). Experimental Evaluations of Stabilization Methods for High Sulfate Soils in Iran Desert Roads. MODARES CIVIL ENGINEERING JOURNAL, 18(3 ), 141-151. SID. https://sid.ir/paper/256913/en

Vancouver: Copy

ARAGHI MORTEZA, NOFERESTI HOSSAIN. Experimental Evaluations of Stabilization Methods for High Sulfate Soils in Iran Desert Roads. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(3 ):141-151. Available from: https://sid.ir/paper/256913/en

IEEE: Copy

MORTEZA ARAGHI, and HOSSAIN NOFERESTI, “Experimental Evaluations of Stabilization Methods for High Sulfate Soils in Iran Desert Roads,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 3 , pp. 141–151, 2018, [Online]. Available: https://sid.ir/paper/256913/en

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